You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
303 lines
8.0 KiB
303 lines
8.0 KiB
/*
|
|
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
|
|
* Copyright (C) 2009 Wind River Systems Inc
|
|
*
|
|
* Based on asm/pgtable-32.h from mips which is:
|
|
*
|
|
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
|
|
* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#ifndef _ASM_NIOS2_PGTABLE_H
|
|
#define _ASM_NIOS2_PGTABLE_H
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/bug.h>
|
|
#include <asm/page.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
#include <asm/pgtable-bits.h>
|
|
#define __ARCH_USE_5LEVEL_HACK
|
|
#include <asm-generic/pgtable-nopmd.h>
|
|
|
|
#define FIRST_USER_ADDRESS 0UL
|
|
|
|
#define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE
|
|
#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)
|
|
|
|
struct mm_struct;
|
|
|
|
/* Helper macro */
|
|
#define MKP(x, w, r) __pgprot(_PAGE_PRESENT | _PAGE_CACHED | \
|
|
((x) ? _PAGE_EXEC : 0) | \
|
|
((r) ? _PAGE_READ : 0) | \
|
|
((w) ? _PAGE_WRITE : 0))
|
|
/*
|
|
* These are the macros that generic kernel code needs
|
|
* (to populate protection_map[])
|
|
*/
|
|
|
|
/* Remove W bit on private pages for COW support */
|
|
#define __P000 MKP(0, 0, 0)
|
|
#define __P001 MKP(0, 0, 1)
|
|
#define __P010 MKP(0, 0, 0) /* COW */
|
|
#define __P011 MKP(0, 0, 1) /* COW */
|
|
#define __P100 MKP(1, 0, 0)
|
|
#define __P101 MKP(1, 0, 1)
|
|
#define __P110 MKP(1, 0, 0) /* COW */
|
|
#define __P111 MKP(1, 0, 1) /* COW */
|
|
|
|
/* Shared pages can have exact HW mapping */
|
|
#define __S000 MKP(0, 0, 0)
|
|
#define __S001 MKP(0, 0, 1)
|
|
#define __S010 MKP(0, 1, 0)
|
|
#define __S011 MKP(0, 1, 1)
|
|
#define __S100 MKP(1, 0, 0)
|
|
#define __S101 MKP(1, 0, 1)
|
|
#define __S110 MKP(1, 1, 0)
|
|
#define __S111 MKP(1, 1, 1)
|
|
|
|
/* Used all over the kernel */
|
|
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
|
|
_PAGE_WRITE | _PAGE_EXEC | _PAGE_GLOBAL)
|
|
|
|
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
|
|
_PAGE_WRITE | _PAGE_ACCESSED)
|
|
|
|
#define PAGE_COPY MKP(0, 0, 1)
|
|
|
|
#define PGD_ORDER 0
|
|
#define PTE_ORDER 0
|
|
|
|
#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
|
|
#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
|
|
|
|
#define USER_PTRS_PER_PGD \
|
|
(CONFIG_NIOS2_KERNEL_MMU_REGION_BASE / PGDIR_SIZE)
|
|
|
|
#define PGDIR_SHIFT 22
|
|
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
|
|
#define PGDIR_MASK (~(PGDIR_SIZE-1))
|
|
|
|
/*
|
|
* ZERO_PAGE is a global shared page that is always zero: used
|
|
* for zero-mapped memory areas etc..
|
|
*/
|
|
extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
|
|
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
|
|
|
|
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
|
|
extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
|
|
|
|
/*
|
|
* (pmds are folded into puds so this doesn't get actually called,
|
|
* but the define is needed for a generic inline function.)
|
|
*/
|
|
static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval)
|
|
{
|
|
pmdptr->pud.pgd.pgd = pmdval.pud.pgd.pgd;
|
|
}
|
|
|
|
/* to find an entry in a page-table-directory */
|
|
#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
|
|
#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
|
|
|
|
static inline int pte_write(pte_t pte) \
|
|
{ return pte_val(pte) & _PAGE_WRITE; }
|
|
static inline int pte_dirty(pte_t pte) \
|
|
{ return pte_val(pte) & _PAGE_DIRTY; }
|
|
static inline int pte_young(pte_t pte) \
|
|
{ return pte_val(pte) & _PAGE_ACCESSED; }
|
|
static inline int pte_special(pte_t pte) { return 0; }
|
|
|
|
#define pgprot_noncached pgprot_noncached
|
|
|
|
static inline pgprot_t pgprot_noncached(pgprot_t _prot)
|
|
{
|
|
unsigned long prot = pgprot_val(_prot);
|
|
|
|
prot &= ~_PAGE_CACHED;
|
|
|
|
return __pgprot(prot);
|
|
}
|
|
|
|
static inline int pte_none(pte_t pte)
|
|
{
|
|
return !(pte_val(pte) & ~(_PAGE_GLOBAL|0xf));
|
|
}
|
|
|
|
static inline int pte_present(pte_t pte) \
|
|
{ return pte_val(pte) & _PAGE_PRESENT; }
|
|
|
|
/*
|
|
* The following only work if pte_present() is true.
|
|
* Undefined behaviour if not..
|
|
*/
|
|
static inline pte_t pte_wrprotect(pte_t pte)
|
|
{
|
|
pte_val(pte) &= ~_PAGE_WRITE;
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkclean(pte_t pte)
|
|
{
|
|
pte_val(pte) &= ~_PAGE_DIRTY;
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkold(pte_t pte)
|
|
{
|
|
pte_val(pte) &= ~_PAGE_ACCESSED;
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkwrite(pte_t pte)
|
|
{
|
|
pte_val(pte) |= _PAGE_WRITE;
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkdirty(pte_t pte)
|
|
{
|
|
pte_val(pte) |= _PAGE_DIRTY;
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
|
|
|
|
static inline pte_t pte_mkyoung(pte_t pte)
|
|
{
|
|
pte_val(pte) |= _PAGE_ACCESSED;
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
|
{
|
|
const unsigned long mask = _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC;
|
|
|
|
pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
|
|
return pte;
|
|
}
|
|
|
|
static inline int pmd_present(pmd_t pmd)
|
|
{
|
|
return (pmd_val(pmd) != (unsigned long) invalid_pte_table)
|
|
&& (pmd_val(pmd) != 0UL);
|
|
}
|
|
|
|
static inline void pmd_clear(pmd_t *pmdp)
|
|
{
|
|
pmd_val(*pmdp) = (unsigned long) invalid_pte_table;
|
|
}
|
|
|
|
#define pte_pfn(pte) (pte_val(pte) & 0xfffff)
|
|
#define pfn_pte(pfn, prot) (__pte(pfn | pgprot_val(prot)))
|
|
#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
|
|
|
|
/*
|
|
* Store a linux PTE into the linux page table.
|
|
*/
|
|
static inline void set_pte(pte_t *ptep, pte_t pteval)
|
|
{
|
|
*ptep = pteval;
|
|
}
|
|
|
|
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep, pte_t pteval)
|
|
{
|
|
unsigned long paddr = (unsigned long)page_to_virt(pte_page(pteval));
|
|
|
|
flush_dcache_range(paddr, paddr + PAGE_SIZE);
|
|
set_pte(ptep, pteval);
|
|
}
|
|
|
|
static inline int pmd_none(pmd_t pmd)
|
|
{
|
|
return (pmd_val(pmd) ==
|
|
(unsigned long) invalid_pte_table) || (pmd_val(pmd) == 0UL);
|
|
}
|
|
|
|
#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
|
|
|
|
static inline void pte_clear(struct mm_struct *mm,
|
|
unsigned long addr, pte_t *ptep)
|
|
{
|
|
pte_t null;
|
|
|
|
pte_val(null) = (addr >> PAGE_SHIFT) & 0xf;
|
|
|
|
set_pte_at(mm, addr, ptep, null);
|
|
flush_tlb_one(addr);
|
|
}
|
|
|
|
/*
|
|
* Conversion functions: convert a page and protection to a page entry,
|
|
* and a page entry and page directory to the page they refer to.
|
|
*/
|
|
#define mk_pte(page, prot) (pfn_pte(page_to_pfn(page), prot))
|
|
|
|
#define pte_unmap(pte) do { } while (0)
|
|
|
|
/*
|
|
* Conversion functions: convert a page and protection to a page entry,
|
|
* and a page entry and page directory to the page they refer to.
|
|
*/
|
|
#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
|
|
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
|
|
#define pmd_page_vaddr(pmd) pmd_val(pmd)
|
|
|
|
#define pte_offset_map(dir, addr) \
|
|
((pte_t *) page_address(pmd_page(*dir)) + \
|
|
(((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
|
|
|
|
/* to find an entry in a kernel page-table-directory */
|
|
#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
|
|
|
|
/* Get the address to the PTE for a vaddr in specific directory */
|
|
#define pte_offset_kernel(dir, addr) \
|
|
((pte_t *) pmd_page_vaddr(*(dir)) + \
|
|
(((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
|
|
|
|
#define pte_ERROR(e) \
|
|
pr_err("%s:%d: bad pte %08lx.\n", \
|
|
__FILE__, __LINE__, pte_val(e))
|
|
#define pgd_ERROR(e) \
|
|
pr_err("%s:%d: bad pgd %08lx.\n", \
|
|
__FILE__, __LINE__, pgd_val(e))
|
|
|
|
/*
|
|
* Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte):
|
|
*
|
|
* 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0
|
|
* 0 0 0 0 type. 0 0 0 0 0 0 offset.........
|
|
*
|
|
* This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file.
|
|
*
|
|
* Note that the offset field is always non-zero, thus !pte_none(pte) is always
|
|
* true.
|
|
*/
|
|
#define __swp_type(swp) (((swp).val >> 26) & 0x3)
|
|
#define __swp_offset(swp) ((swp).val & 0xfffff)
|
|
#define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 26) \
|
|
| ((off) & 0xfffff) })
|
|
#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
|
|
|
|
#define kern_addr_valid(addr) (1)
|
|
|
|
#include <asm-generic/pgtable.h>
|
|
|
|
#define pgtable_cache_init() do { } while (0)
|
|
|
|
extern void __init paging_init(void);
|
|
extern void __init mmu_init(void);
|
|
|
|
extern void update_mmu_cache(struct vm_area_struct *vma,
|
|
unsigned long address, pte_t *pte);
|
|
|
|
#endif /* _ASM_NIOS2_PGTABLE_H */
|
|
|